JPH0726618B2 - Scroll compressor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and in particular, an orbiting scroll shaft is provided eccentrically in a main shaft, and an Oldham coupling is provided between the orbiting scroll shaft end and a casing. The present invention relates to a scroll compressor.

2. Description of the Related Art FIG. 4 shows an example of a general structure of a conventional scroll compressor.

The main shaft 11A is the intermediate wall 13A of the casing 10A and the rear cover 14A.
It is pivotally supported by a bearing 15A and a bearing 16A which are fitted in the casing 10A and is housed in a casing 10A. An eccentric crankshaft 30 is provided on one end side (lower end side in the figure) of the main shaft 11A.
The orbiting scroll 25 is pivotally mounted on the bearing 30 via a bearing 31.
Further, a pair of balancers 19A, 20A are fixed to the main shaft 11A, and a rotor 21A is fixed. The rotor 21A is a casing
The main shaft 11A is rotated by engaging the stator 22A fixed to 10A. The wrap 25a of the orbiting scroll 25 is the casing 10A.
Engaged with the wrap 26a of the fixed scroll 26 fixed to,
The medium introduced from the suction port 27 is compressed and discharged from the discharge port 28. The end plate 25b of the orbiting scroll 25 is thrust-supported by the shoulder portion 33 of the casing 10A, and is orbitally moved by the rotation of the main shaft 11A. In order to restrain the rotation at this time, an Oldham coupling 32 is attached between the orbiting scroll 25 and the casing 10A. The Oldham coupling 32 is formed of a ring-shaped member that is inserted and attached so as to surround the main shaft 11A, and the first projection 32a provided on the circumference thereof is locked in the groove 23 of the orbiting scroll 25.
A second protrusion (not shown) orthogonal to the first protrusion 32a is arranged so as to be locked in a groove (not shown) provided in the casing 10A. The seal members 29A and 29B inserted into the intermediate wall 13A are for blocking communication between the chamber in which the orbiting scroll 25 is stored and the chamber in which the rotor 21A and the like are stored.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the scroll compressor having the above structure, the crankshaft having a short shaft length is used.
Since the orbiting scroll 25 is pivotally supported by 30, the rattling of the orbiting scroll 25 is likely to occur in the thrust direction, a large pressing force is applied to the shoulder portion 33 and the bearing 31, and smooth orbiting cannot be performed. Furthermore, as described above, the Oldham coupling 32 is different from the structure that is normally adopted,
Since it is formed from a ring-shaped member, the cost is high, it is necessary to provide a groove 23 in the orbiting scroll 25 or to form a groove (not shown) on the casing 10A side, which has a drawback that the structure becomes complicated, There is also a problem that it takes time to replace the Oldham coupling 32.

The present invention solves the above-mentioned problems, and provides a scroll compressor having a structure in which an orbiting scroll is smoothly orbitally moved, a general Oldham coupling is adopted, and the replacement thereof can be easily performed.

Means for Solving the Problems The present invention is therefore pivotally supported in a through hole (12) eccentrically formed on a main shaft (11) pivotally supported at the center of a casing (10) on the stationary side, Orbiting scroll (2
The orbiting scroll shaft (1) for connecting 5) and the other end of the orbiting scroll shaft (1) are slidably supported in the radial direction and are slid on the stationary bracket (7). A scroll compressor having an Oldham coupling (3) slidably supported in a direction perpendicular to the direction,
The orbiting scroll shaft (1) constitutes a scroll compressor in which the orbiting scroll shaft (1) is eccentrically supported by the orbiting radius with respect to the main shaft (11).

Action The bearings provided in the main shaft separated from each other in the axial direction eliminate the play in the thrust direction of the orbiting scroll, enabling smooth orbital movement, and the end of the orbiting scroll penetrates into the main shaft and projects out of the casing. As a result, it becomes possible to connect the orbiting scroll shaft end and the casing with a general Oldham coupling.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a main shaft 11 is housed in a casing 10, and the main shaft 11 includes an intermediate wall 13 and a rear cover 14 of the casing 10.
It is pivotally supported on the casing 10 through bearings 15 and 16 which are fitted inside and which can receive thrust and radial loads. A through hole 12 is provided in the main shaft 11 along the axial direction. The through hole 12 is formed eccentrically by the turning radius.
The orbiting scroll shaft 1 is pivotally supported in the through hole 12 by bearings 17 and 18. The bearings 17 and 18 are formed of a structure capable of receiving thrust and radial loads, and are arranged apart from each other in the axial direction of the main shaft 11. An orbiting scroll 25 is fixed to one end of the orbiting scroll shaft 1. Further, a pair of balancers 19, 20 are fixed to the outer periphery of the main shaft 11, and a rotor 21 is fixed. The rotor 21 engages with a stator 22 fixed to the casing 10 to rotate the main shaft 11. The wrap 25a of the orbiting scroll 25 engages with the wrap 26a of the fixed scroll 26 fixed to the casing 10, compresses the medium introduced from the suction port 27, and discharges it from the discharge port 28. A seal member 29 is attached to the intermediate wall 13 in order to block communication between the chamber in which the orbiting scroll 25 is stored and the chamber in which the rotor 21 and the like are stored. A thrust bearing 24 is provided between the upper end surface of the orbiting scroll 25 and the end surface of the main shaft 11 which faces the orbiting scroll 25. The thrust force of the orbiting scroll 25 is supported by the end surface of the main shaft 11 via the thrust bearing 24.

The orbiting scroll shaft 1 penetrates the through hole 12 and projects from the top of the main shaft 11 in the drawing. That is, the rear cover 14 of the casing 10.
It is arranged so as to project from. A groove 2 is formed at the end of the orbiting scroll shaft 1 on the protruding side so as to cross the axis. on the other hand,
The bracket 7 is fixed on the rear cover 14 by bolts 9, and the protrusion 8 is formed in the bracket 7 in the direction orthogonal to the groove 2.
Is formed.

The Oldham's joint 3 is formed as shown in FIGS. 2 and 3, and is provided in the groove 2 at the upper end of the orbiting scroll shaft 1 and the protrusion 8 of the bracket 7. The Oldham's joint 3 in this case has a shape that is generally adopted, and as shown in the drawing, the disk portion 6 and the protruding portion 4 that is convexly provided on the one surface side thereof.
And a groove portion 5 formed on the other end side and orthogonal to the protruding portion 4. In the Oldham joint having the above-mentioned shape, the protrusion 1 is locked in the groove 2 of the orbiting scroll shaft 1 and the protrusion 8 of the bracket 1 is locked in the groove 5 in the bracket 1
It is stored inside.

By the rotation of the main shaft 11, the orbiting scroll shaft 1 orbits while its rotation is restricted by the Oldham coupling 3. In this case, the thrust force of the orbiting scroll 25 is supported by the bearings 17 and 18 and the thrust bearing 24. As described above, the bearings 17 and 18 are formed in a structure capable of receiving thrust and radial loads, and are disposed in the main shaft 11 at a distance from each other, so that the orbiting scroll 25 is supported without rattling,
It is supported by the thrust bearing 24 and smoothly moves along the end surface of the main shaft 11. Further, since the thrust (load) along the axis of the orbiting scroll shaft is a columnar shaft, it is relieved by a torsional moment, etc., and the action of the Oldham coupling of the present invention works more effectively on the rotation of the orbiting scroll. As described above, the mechanical loss can be reduced and the life of the bearing can be improved.

In this embodiment, as described above, a very general Oldham coupling 3 is used.
Since it is adopted, it can be implemented at a lower cost than that of the prior art. Also, by removing the bracket 7 from the rear cover 14, the Oldham coupling 3 can be easily removed. Also, as in the prior art, the orbiting scroll 25 has grooves 23
It is not necessary to form (FIG. 4) or to form the groove on the casing side. The groove 2 of the orbiting scroll shaft 1 can be easily processed, and the bracket 7 can be easily formed.

Although the thrust bearing 24 is provided between the orbiting scroll 25 and the main shaft 11 in this embodiment, it may be provided between the end plate 25b and the shoulder portion 33. Further, the protrusion 8 formed on the bracket 7 may not be formed integrally with the bracket 7 but may be detachably fixed to another object.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, the orbiting scroll can be smoothly moved, the mechanical efficiency can be improved, and a general inexpensive Oldham coupling can be adopted. The effect of improving maintainability can be enhanced.

[Brief description of drawings]

1 is an axial sectional view of an embodiment of the present invention, FIG. 2 is a plan view of an Oldham coupling used in the embodiment, FIG. 3 is a side view of the Oldham coupling, and FIG. 4 is an outline of a conventional scroll compressor. It is an axial sectional view showing a structure. 1 ... Orbiting scroll shaft, 2 ... Groove, 3,32 ... Oldham coupling, 4 ... Projection part, 5 ... Groove part, 6 ... Disc shape, 7 ...
... Bracket, 8 ... Protrusion, 9 ... Bolt, 10,10A ...
… Casing, 11,11A …… Spindle, 12 …… Through hole, 13,13A
...... Middle wall, 14,14A …… Rear cover, 15,15A, 16,16A, 17,1
8,31 …… Bearing, 19,19A, 20,20A …… Balancer, 21,21A…
… Rotor, 22,22A …… Stator, 23 …… Groove, 24 …… Thrust bearing, 25 …… Swirl scroll, 25a, 26a …… Lap, 26 …… Fixed scroll, 27 …… Suction port, 28 …… Discharge Outlet, 29, 29a, 29b …… Seal member, 30 …… Crankshaft, 32
a ... projection.

Claims (1)

[Claims] Claim: What is claimed is: 1. A casing (10) on the stationary side is pivotally supported in a through hole (12) formed eccentrically with a main shaft (11) pivotally supported at the center of the casing (10), and an orbiting scroll (25) is provided at one end thereof. The orbiting scroll shaft (1) to be connected is slidably supported on the other end side of the orbiting scroll shaft (1) along the radial direction, and is perpendicular to the sliding direction on the stationary bracket (7). A scroll compressor having an Oldham's joint (3) slidably supported along a rotating direction, wherein the orbiting scroll shaft (1) is eccentric to the main shaft (11) by an orbiting radius and is pivotally supported. A scroll compressor characterized by being processed.